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I shot a portion of a music video in stop motion. I need help with figuring out how to to make the photos the correct speed so I can sync them up to the music and vocals i am using for the video. I shot the video at 24 frames per second on a canon t3i. I am using final cut pro 7 to edit with. Any help would be greatly appreciated.

If you planned it out correctly all you should have to have to do is take the amount of frames you have to fill and divide that by how many photos you have.
So say you have 10 seconds to fill and 50 pictures. 240 frames/50 pics=4.8 frames each.
Unfortunately you can't do less than 1 frame (unless you magically came up with a whole number) so you round up and just cut off the excess and you will end up with your best and quickest result.

Next time try to find out the length of each frame you want (If you have time I agree with zythe84 try to do the same frame rate you are shooting the video at) and plan out in advance.

The ideal situation would be that you planned your animated shot so that each still frame represents 1/24th of a second. If this is the case, you should be able to lay each still in a timeline, then set it to a duration of one frame. It will then playback at 24fps, and look smooth. If it is not in time, this is more likely a result of how you shot it. Try it with each still duration at 2frames, which will look more like 12fps. Any more than that, and it will probably appear quite jerky, although if it is to the beat of a song, it may be your desired aesthetic.

How many stills do you have, and what is the duration of the segment in which you are trying to make those stills fit?

I'm having a little trouble understanding your exact situation. Could you upload a video, and perhaps I could be more specific?

This should really be done in After Effects or some other compositer, and then exported to FCP7. Or even iStopmotion (and exported to FCP7). But there's a way to do this in FCP7 (painfully):

If you imported it into FCP7 with the default import duration set to 1 frame, then your photos will already be at 24fps (because they are in a 24fps sequence). though, I would suggest selecting all of your frames and dragging so that each image is worth 2 frames. That brings you to 12fps which will work much better for stop motion.

For the lip sync, run through the sequence everytime that person's mouth forms a phoneme. Then drag each corresponding frame to that marker and drag the duration of the frame to the length of the mouth position.

If that timing was already meticulously planned during production, then just turn all of your frames into a nested sequence (mac: opt+cmd+c) and use the speed/duration dialogue box.